Powdered-fuel-burning boiler furnace



May 27, 1930. s. A. JACQUES POWDERED FUEL BURNING BOILER FURNACE Filed Aug. 24, 1926 2 Sheets-Sheet l A TTORNEY May 27, 1930. S. A. JACQUES v 1,760 140 POWDERED FUEL BURNING BOILER FURNACE Filed Aug. 24, 1926 k2 sheets-Sheet 2 Patented ay 2?, 1930 rea aan

STANLEY A. JACQUES, F' CHICAGO, ILLINOIS, ASSIGNOR TO INTERNATIONAL COM- BUSTION ENGINEERING CORPORATION, OF NEW YORK, N. Y., A CORPORATION OF DELAWARE POWDERED-FUEL-BURNING .BOILER .'EURNACE Application filed August 24, 1926.

'This invention relates to boiler furnaces, and particularly to those in which the fuel to be burned is in powdered form, as, for example, pulverized coal. Stated in another way, the invention is particularly useful in connection with pulverized fuel burning furnaces in which the. combustion chamber` is largely defined by tubular water walls.

One of the primary objects of the invention lo is to provide, in a furnace ofthe. character described, substantial-uniformity of circulation conditionsl throughout.

More specically, it is an object of the inventio'n to provide the novel assemblage and combination of parts hereinafter described.

How the foregoing, together with such other objects and advantages as may hereinafter appear, or are incident to my invention, are realized, is illustrated in vpreferred form in the accompanying drawings, where- Fig. 1 is a vertical sectionthrough a powdered fuel burning furnace illustrating my improvements, with certain of the parts ap'- pearing in elevation;

Fig. 1a is a fragmentary side elevation illustrating certain headers and connection tubes of Fig. 1 in full view;

Fig/2 is a fragmentary plan section taken substantially on the line 2-2 of Fig. l;

Fig. 3 is a fragmentary sectional elevation of a modification of the invention; and

Fig. i is a fragmentary plan sectionv of Fig. 3.

Referring to Fig. 1, the reference character A denotes the combustion space or chamber. of the boiler furnace, which chamber is largely defined by evaporating elements or water walls. Powdered fuel and air may be admitted to the combustion chamber in a downward direction through one or more burners 1 located in the roof 2. Air, in addition to that -admitted with the fuel, may be admitted through a number of damper-con-- trolled intakes 3 in the front wallt. They two side walls lof the combustion chamber are provided with water walls B composedA of a plurality of vertically extending tubes, and the rear wall is provided with a similar water wall C. The tubes of these walls are prefer- Serial No. 131,149.

ably provided with fins which cooperate with the tubes to constitute the evaporating walls. A water screen D defines the lower portion of the combustion space of the furnace, which screen is composed of a plurality of tubes spaced sufficiently apart to allow the refuse precipitating out of the fuel and flame stream to pass through the screen.

The water walls are provided with appropriate headers, and it will be seen that the tubes of the side walls B connect, at theirlower ends, into a header 5, and at their upper ends into the headers 6 and 7. In the embodiment shown, it is pointed out that certain of the tubes of the side walls B are shorter than others, the longer tubes 8 being connected at their upper ends of the -header .6 -and the shorter tubes 9 to the header 7.

These vheaders 6 and 7 are connected in circulation by means of the connecting tubes 10. By this arrangement of the tubes of the side walls, protection is afforded for the -throat of the combustion chamber.

The tubes 11 of the rear wall C connect at their upper ends into the upper headers 12, and at their lower ends into the junction blocks or` boxes 13, and the tubes 14 of the water screen D connect at one end into the header 15, and at the other end into the junction blocks 13, which are common to the water screen and the rear wall.

Theheaders above referred to are preferably located on the outside of the furnace,

and the tubes connecting them pass through the furnace walls, the tubes of the side and rear walls being suitably bent for connection to their headers. f

A relatively light sheathing 16 is associated with the tubular walls, and an ash pit 17 is provided beneath the water screen D for rethe throat of the furnace, the tubes thereof inclining slightly forwardly and upwardly, which'boiler is heated by the productsof combustion leaving the chamber A.

boiler.

In this connection, it is pointed out that the upcomer tubes are so4 arranged as to oo nstitute a row of the tubes of the tubular b011- er, as clearly illustrated in Flgs. l and 2, which improves the circulation, and also maintains uniformity of circulation throu hout all of the water walls. The upcomer tu es leading from the rear wall extend upwardly A from the header 12 and then longitudinally of the boiler, and the upcomer tubes leading from the side walls extend inwardly from' the headers 6 and then longitudinally of the boiler, so that a row of substantially horizontal upcomer tubes is provided passing across the throat of the combustion chamber.

- In the modification illustratedv in Figs. 3 and 4, the upcomers are carried up between' certainrows ofthe tubes of the tubular bo1ler, so lthat they constitute an upper row of said tubes. y

The advantages of the arrangements herein set forth will be fully understood by those skilled in the art.

Referring to the arrangement ofjFig. 1, it will be seen that the top, bottom, sldes, and

. rear of the combustion space are defined by tubes subject to radiant heat, and that there is circulation inone direction through all of such tubes, the various water tubes being connected in the same general fashion to the boiler, whereby subtsantially uniform conditions maintain throughout.

, I claim 1. In combination with a substantially -horizontal tubular boiler, a combustion chamber therebelow having side water walls including appropriate headers, upcomers for said water walls connected into the circulation of the boiler and constituting a portion of a row of the tubes of the tubular boiler, and means for introducing fuel to be burned in 1 said combustion chamber.

2. In combination with a substantially horizontal tubular boiler, a combustion chamber therebelow for burning fuel in suspension having side water Walls including appropriate headers located outside the combustion chamber, upcomers for said waterwalls conl nected into the circulation of the boiler, said upcomers beingdirected inwardly then longitudinally of the boiler, and being connected into a header of said boiler so as to constitute a portion of-a row of the tubes thereof, and,

' 4. lIn` combination with a substantially v horizontal tubular boiler, a combustion chamber therebelow including side tubular walls, upper and lower headers into which the tubes thereof connect, a rear tubular wall, an upper header and lower junction boxes into whlch f the tubes'thereof connect, a water screen in the lower portion of the combustion cham` ber, a header at one endthereof into which the tubes of said screen connect, the other end of saidtu'bes connecting into thelower junction boxes of the rear wall, adowncomer connection from the boiler to said water screen and to said side walls, and upcomer means leading from the side walls and the rear wall to the boiler comprising a plurality of tubes arranged to constitute a row of the tubes of the tubular boiler. i 5. In combination with a tubular boiler, a combustion chamber therefor includingf'side tubular water walls, tubes of which areshorter than other tubes thereof, a lowerfvheader for said tubes, an upper header for theshorter tubes, an upper header for the. longer tubes, means establishing communication between said upper headers, and upcomer tubes for said side walls comprising a plurality of tubes arranged to constitute a row of the tubes of said boiler, saidcombustion chamber having a throat into which the longer tubes extend. y

6. In combination with a tubular boiler, a combustion chamber therefor including side tubular water walls, tubes of which are shorter than other tubes thereof, a lower header for said tubes, an upper header for the shorter tubes, an upper header for the longer tubes, means establishing communication between said upper headers, and downcomer and upcomer` means-for' connecting said walls into STANLEY A. JACQUES.

whereof I have hereunto 1 the circulation of the boiler, said combustion i 

